Non-clogable self-cleaning screen



A. G. TURNER.

NON-CIQOGABLE SELF CLEANING SCREEN. 7

APPLICATION FlLED JAN.19,1918.

1,343,292. I Patented June 15,1920.

2 SHEETSSHEET l.

El mumgmm IIIIimIYI/IYIY/EIK- A.'G. TURNER.

NON-GLOGABLE SELF CLEANING SCREEN.

APPLICATION FILED JAN. I9,-l9l8.

Patented June 15, 1920.

2 SHEETS--SHEET 2.

uuantoz ALONZO G. TURNER, or HANKSVILLE, UTAH.

NON-CLOGABLE SELF-CLEANING SCREEN.

Specification of Letters Patent. Pate t d he 15 1920,

Application filed January 19, 1918. Serial No. 212,727.

My invention relates to sifters and screens for use in the process ofgrading, assorting and separating gravel, metalliferous minerals, coal,or other substances, preparatory to subsequent treatment or use.

More particularly stated, the invention relates tosifters andself-clearing non-closable screens of the rotary type especiallydesigned and adapted for screening gravel and other detritus taken froma river bed, or any source of supply by agency of suitable dredges orotherwise.

While,therefore, the present invention is adapted for a wide range ofusefulness, and for the treatment of various substances and Icommodities, the primary object of the present invention is theproduction of novel and improved mechanism whereby gravel or othermetalliferous deposits, recovered from river beds or similar locations,by agency 7 of dredges, may be conducted longitudinally through a rotarycylindrical screen, and properly sifted preparatory to the process ofsluicing, or other concentrating processes.

A further object of this invention is to prevent screen clogging by theproduction of novel and highly efficient means for automatically jarringloose from the interior of the screen detritus under treatment, as alsoany substances which might become temporarily lodged therein, and, as aconsequence, more or less obstruct'the process of screening. a l

A further object is the production of screening apparatus of thecharacter indioated, whichis peculiarly eflicient in opera tion, durablein construction, and not likely to become deranged no matter how heavythe load imposed upon it.

With the foregoing and other objects and I advantages in View, theinvention will now be more particularly described, and then pointed outby the following claims.

In the accompanying drawings which form part of this application forLetters Patent, and whereon like numerals refer to.

corresponding parts in the several views Figure -1 is a side elevationof my. invention in position for use including the end of a supply ordelivery chute.

F ig: 2 is a transverse sectional view taken on the line 2'2 of Fig. 1,showing the discharge or outlet end of the structure.

Fig. 3 is a .detail fragmentary view taken at the opposite or receivingend of the structure, showing a section of its toothed endring, and oneof the screening bars, the latter in side elevation and broken away foreconomy of space. v

Fig. 4 is also a fragmentary View taken at the discharge end of thestructure, corresponding with Fig. 8,6XCGPl) for the fact that itillustrates one'of the relatively movable screening bars.

Fig. 5 is also a detailed fragmentary view in section taken throughseveral alternately fixed and movable screening bars intermetion.

Fig. 7 is a view similar to Fig. 6, but of a-modified form of screenshowing a double series of screening bars, and, v

Fig. 8 is a fragmentary detail view showing in side elevation a portionof one of the segmental supporting plates, with suitable openingstherein for reception of the ends of screening bars.

Reference being had to the drawings and numerals thereon, -1 indicatessuitable foundation piers for supporting the structure, having rotatablymounted therein-flanged guide rollers 2 for supporting the screenproper. As plainly indicated by Fig. 1,the said roller bearings 2 arearrangedin oppositely disposed'pairs, each pair being arranged indifferent vhorizontal planes in order that the screen'as a whole maybe'supported at an angle so as to encourage and necessitate a flow ofthe materials under treatment from the upper entering to the lowerdischarge end of the structure.

The structure consists essentially of two end-rings or annuli 3 and 4connected by tie rods or bolts 5, and a double series ofcircumferentially arranged relatively fixed and movable screening bars 6and 7, respectively, interposed between said annuli, as best shown byFig. 1 of the drawings.

Both the annulus 3 at the upper receiving end of the structure, and theannulus 4 at its lower discharge end are recessed as shown at 8 in Figs.3 and 4, and within these recesses are positioned segmental plates 9detachably secured thereto by agency of bolts 10. These plates 9 ofsuitable thickness and material are punched out as at 11, or otherwiseformed, to receive the ends of all bars 6 and 7, the former, 6, fittingclosely, and, with relation to its plate, immovably, and the latterfitting loosely so as to permit of slight radial movement as indicatedby Fig. 6.

Thelength of these bars 6 and 7 determines the length of the screen,they are preferably of rolled steel having enlarged ends and arelatively fiat connecting web. They may, however, be of any crosssectional area. provided only that the outer edge is of greatercross-sectional area than that of the body or web of the rail.

Surrounding all bars 6 and 7 at points intermediate their ends areendless bands 12 of relatively stiff metal, for the purpose ofstiffening the structure to prevent undue flexing or sagging of saidbars, and

at intervals these bands 12 are secured in place by set-screws 13passing therethrough and bearing upon certain of the relatively fixedbars 6, as indicated by Figs. 1 and 5. As a convenient means of slowlyrotating the screen about its longitudinal axis, there may be providedat one end of the structure a power shaft 14 drivenby any suitable primemover or source of power (not shown), and having keyed thereon a beveledspur gear 15, adaptedto mesh with a large driven gear 16, aifixed to theouter face of annulus 3. And obviously a larger or smaller driving gear15 may readily be substituted for that shown when it may becomenecessary or desirable to vary the rotary speed of the screen. 7

Referring particularly to Fig. 7 of the drawings representingonemodified form of the present invention, it will be observed that thesegmental plates 9 are all punched through or otherwise formed with adouble series of pockets 11 constituting two concentric series of 7 saidpockets, within which are mounted the ends of all bars 6 and 7 beingalternately fixed and movable,

and moreover, it will be noted that additional circular serles ofscreening bars may thus be mounted in'plates such as 9 when desired, forthe purpose of insuring a finer gradation ofthe material or materialsunder treatment. 7

This being a general description of my present invention illustratingone embodi ment thereof, it should be understood that I by no meansconfine myself to the particular arrangement and combination of partsshown nor to the proportions and materials indicated. On the contrary,the structure may be varied indefinitely in these respects without inthe least departing'from the spirit of my invention, and in any eventthe operation is substantially as follows:

Gravel from any well known form of dredging machine (not shown) isdelivered by means of a chute such as A, Fig. 1, into the upper'open endofthe screen proper through itsannulus 3. This delivery is continuousand serves to constantly charge the screen with a supply of gravel forscreening. In the meantime power from any suitable prime mover or sourceof supply, operating through shaft 14 driving gear 15, and the drivengear 16 serves to rotatev the entire screen about its longitudinal axis,upon its roller bearing supports 2, thoroughly agitating its contents.

The spaces between the upper ends of screening bars 6 and 7 at bottom ofscreen being determined, permits the escape by "gravity therethrough ofgravel of proper size into a suitable sluice box below (not shown),after which it is subjected to the well'known sluicing process, or othermeans of concentration. In this relation of parts as shown at bottom ofFig. 2, it will be seen that all bars 6 and 7 are concentricallypositioned, those numbered 6 being relatively" fixed and immovable intheir slotted bearings 11 of the segmental plates 9,'and'those numbered7 being at their outermost radial positions in their respectiveelongated slot- -ted bearings 11. As rotation of the screen advances,however, and each of the bars 7 reaches an elevated position oran angleof approximately forty-five degrees the same is dropped forciblythroughout its entire length by gravity, thereby jarring loose andeffectually clearing the structure of any obstruction or accumulation offoreign matter which might otherwise'have clogged the screen and.interfered. with its intended functions. i

This operation is repeated indefinitely, each bar 7 of the entirecircumferential series automatically dropping by gravity when it reachesthe proper elevatedposition, and likewise being returned by gravity toits normal position as it passes down upon the opposite side of thestructure, an effectual clearing of the screening bars being thusinsured by the jarring or shaking loose action, augmented by the factthat greater clearance spaceisthus obtained between the ends of all barswhen so dropped, as clearly shown at theupper portion of Figs. 2, 6 and7 of the drawings.

Having thus described my invention in one form of embodiment, what I nowclaim and desire to secure by Letters Patent is:

1. In a rotary screen of the character indicated the combination withsuitable end supports provided with radial slots, of .a series ofindependent screening bars freely mounted in said slots and adapted togravitate to their lowermost positions as the screen is rotated.

2. In a rotary screen of the character indicated the combination withsuitable end supports provided with radial slots, of a circumferentialseries of spaced apart independent screening bars freely mounted in saidslots and adapted to gravitate to their lowermost positions as thescreen is rotated.

3. In a rotary screen of the character indicated the combination withsuitable end supports provided with radial slots, of a continuous seriesof alternately fixedand radially movable independent screening bars thelatter freely mounted in said slots and adapted to gravitate to theirlowermost positions as the screen is rotated.

i. In a rotary screen of the character indicated the combination withannular. end supports provided with radial slots, of a circumferentialseries of independent screenand a second series of relatively fixedscreening bars alternating with the bars aforesaid.

6. In a cylindrical rotary screen of, the character indicated thecombination with annular end supports provided with radial slots of acontinuous series of independent alternately fixed and movable screeningbars the latter freely mounted in said slots to gravitate therein as thescreen isrotated,

stifiening bands surrounding all of said bars 7 intermediate the endsthereof, and means for rotating the screen about its longitudinal axis.I

In testimony whereof I ailix my signature in presence of two subscribingwitnesses.

V ALONZO G. TURNER. WVitnesses:

E. DYRE, M. D. BALLAUF.

